It never fails that every time they update their software they create numerous problems like this instability.  Prior to the update which took place a few weeks ago I had no problems with QB 2020 crashing but since then every time I use it I have to keep my fingers crossed that I will be able to open it without it crashing immediately and if I am lucky then may be able to get some actual work done before it becomes unstable and crashes again. 

All the runaround from their technical support is just to hide the fact that this is the worst software, ever.  Always has been terrible, and unfortunately I am "married" to it because it has the past 15 years of my financial information in it.  They just want you to buy the newer version which will work well for a few months then they'll update it or call it no longer supported so you have to buy the next version.  So much wasted time and money I should go back to a ledger book.  I am sure they are working on a fix that will cure this but create other problems.  Just leave it alone when it works.